The everyday life of Arnold, a 4th-grader in a nameless city that resembles Brooklyn, New York, who lives in a multi-racial boarding house with his grandparents and a motley assortment of neighbors and friends.

A novice sleuth is hired by the police after he cons them into thinking he has psychic powers which help solve crimes. With the assistance of his reluctant best friend, the duo take on a series of complicated cases.